Thats why second hand minis are always the best route. Even if you have to replace a gear set, or every plastic chassis component, as long as the alloy isnt bent, its much much cheaper way to go.
Granpa, check out the bluebird servos from HK. For $45 i thought it would be rubbish, but its been spectacular and hasnt missed a beat. I got the BMS-955DMG, metal geared, low profile and very quick!